The utility model discloses a preparation has laboratory bench of joint crack test piece at random, include laboratory bench frame, freezing case, freezing case lid, low temperature storage box, freezing pan, multifunctional electronic scale, tray, mixer, main drain hole, vice blowing pipeline, vice drain hole, discharge control device, control panel, test piece mould, shaking table, discharge gate, pull pull ring, scraper. This laboratory bench left side is freezing case, it has control panel to inlay on the laboratory bench desktop, mixer upper portion is connected with main drain hole, andthe lower part links to each other with the discharge gate, discharge control device places port under the mixer in, draw -in groove guide test piece mould rectilinear movement in shaking table upperportion accomplishes the material in proper order and loads. The utility model provides a present simulation test in experimental the preparation have the problem that joint crack test piece exists, realize to the approximate of on -the -spot coal, rock mass and emulation that the design of laboratory bench is with production process organic solidarity in addition, convenient to use is simple, andis efficient, has overcome the not enough of prior art.